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https://issues.apache.org/jira/browse/HDFS-9952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15213915#comment-15213915
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Walter Su commented on HDFS-9952:
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Thanks [~vinayrpet] for updating. Just one minor suggestion:
We should take care of {{readUnlock()}} being called even if currentThread
doesn't have it actually. Just like {{writeUnlock()}} did. Better safe than
sorry.
Otherwise, The patch looks pretty good to me. +1 once addressed. It would be
great if [~daryn] can also take a look.
> Expose FSNamesystem lock wait time as metrics
> ---------------------------------------------
>
> Key: HDFS-9952
> URL: https://issues.apache.org/jira/browse/HDFS-9952
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Vinayakumar B
> Assignee: Vinayakumar B
> Attachments: HDFS-9952-01.patch, HDFS-9952-02.patch,
> HDFS-9952-03.patch
>
>
> Expose FSNameSystem's readlock() and writeLock() wait time as metrics.
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